Deuterated OTX-015

ABSTRACT

This invention relates to novel thieno[3,2-f][1,2,4]triazolo[4,3-a][1,4]diazepines, and pharmaceutically acceptable salts thereof. This invention also provides compositions comprising a compound of this invention and the use of such compositions in methods of treating diseases and conditions that are beneficially treated by administering an inhibitor of binding between an acetylated histone and a bromodomain-containing protein.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a National Stage application under 35 U.S.C. § 371 of International Application No. PCT/US2016/029579, having an International Filing Date of Apr. 27, 2016, which claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Application No. 62/153,383, filed Apr. 27, 2015, the contents of which are incorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION

Many current medicines suffer from poor absorption, distribution, metabolism and/or excretion (ADME) properties that prevent their wider use or limit their use in certain indications. Poor ADME properties are also a major reason for the failure of drug candidates in clinical trials. While formulation technologies and prodrug strategies can be employed in some cases to improve certain ADME properties, these approaches often fail to address the underlying ADME problems that exist for many drugs and drug candidates. One such problem is rapid metabolism that causes a number of drugs, which otherwise would be highly effective in treating a disease, to be cleared too rapidly from the body. A possible solution to rapid drug clearance is frequent or high dosing to attain a sufficiently high plasma level of drug. This, however, introduces a number of potential treatment problems such as poor patient compliance with the dosing regimen, side effects that become more acute with higher doses, and increased cost of treatment. A rapidly metabolized drug may also expose patients to undesirable toxic or reactive metabolites.

Another ADME limitation that affects many medicines is the formation of toxic or biologically reactive metabolites. As a result, some patients receiving the drug may experience toxicities, or the safe dosing of such drugs may be limited such that patients receive a suboptimal amount of the active agent. In certain cases, modifying dosing intervals or formulation approaches can help to reduce clinical adverse effects, but often the formation of such undesirable metabolites is intrinsic to the metabolism of the compound.

In some select cases, a metabolic inhibitor will be co-administered with a drug that is cleared too rapidly. Such is the case with the protease inhibitor class of drugs that are used to treat HIV infection. The FDA recommends that these drugs be co-dosed with ritonavir, an inhibitor of cytochrome P450 enzyme 3A4 (CYP3A4), the enzyme typically responsible for their metabolism (see Kempf, D. J. et al., Antimicrobial agents and chemotherapy, 1997, 41(3): 654-60). Ritonavir, however, causes adverse effects and adds to the pill burden for HIV patients who must already take a combination of different drugs. Similarly, the CYP2D6 inhibitor quinidine has been added to dextromethorphan for the purpose of reducing rapid CYP2D6 metabolism of dextromethorphan in a treatment of pseudobulbar affect. Quinidine, however, has unwanted side effects that greatly limit its use in potential combination therapy (see Wang, L et al., Clinical Pharmacology and Therapeutics, 1994, 56(6 Pt 1): 659-67; and FDA label for quinidine at www.accessdata.fda.gov).

In general, combining drugs with cytochrome P450 inhibitors is not a satisfactory strategy for decreasing drug clearance. The inhibition of a CYP enzyme's activity can affect the metabolism and clearance of other drugs metabolized by that same enzyme. CYP inhibition can cause other drugs to accumulate in the body to toxic levels.

A potentially attractive strategy for improving a drug's metabolic properties is deuterium modification. In this approach, one attempts to slow the CYP-mediated metabolism of a drug or to reduce the formation of undesirable metabolites by replacing one or more hydrogen atoms with deuterium atoms. Deuterium is a safe, stable, non-radioactive isotope of hydrogen. Compared to hydrogen, deuterium forms stronger bonds with carbon. In select cases, the increased bond strength imparted by deuterium can positively impact the ADME properties of a drug, creating the potential for improved drug efficacy, safety, and/or tolerability. At the same time, because the size and shape of deuterium are essentially identical to those of hydrogen, replacement of hydrogen by deuterium would not be expected to affect the biochemical potency and selectivity of the drug as compared to the original chemical entity that contains only hydrogen.

Over the past 35 years, the effects of deuterium substitution on the rate of metabolism have been reported for a very small percentage of approved drugs (see, e.g., Blake, M I et al, J Pharm Sci, 1975, 64:367-91; Foster, AB, Adv Drug Res 1985, 14:1-40 (“Foster”); Kushner, D J et al, Can J Physiol Pharmacol 1999, 79-88; Fisher, M B et al, Curr Opin Drug Discov Devel, 2006, 9:101-09 (“Fisher”)). The results have been variable and unpredictable. For some compounds deuteration caused decreased metabolic clearance in vivo. For others, there was no change in metabolism. Still others demonstrated increased metabolic clearance. The variability in deuterium effects has also led experts to question or dismiss deuterium modification as a viable drug design strategy for inhibiting adverse metabolism (see Foster at p. 35 and Fisher at p. 101).

The effects of deuterium modification on a drug's metabolic properties are not predictable even when deuterium atoms are incorporated at known sites of metabolism. Only by actually preparing and testing a deuterated drug can one determine if and how the rate of metabolism will differ from that of its non-deuterated counterpart. See, for example, Fukuto et al. (J. Med. Chem. 1991, 34, 2871-76). Many drugs have multiple sites where metabolism is possible. The site(s) where deuterium substitution is required and the extent of deuteration necessary to see an effect on metabolism, if any, will be different for each drug.

SUMMARY OF THE INVENTION

This invention relates to novel thieno[3,2-f][1,2,4]triazolo[4,3-a][1,4]diazepines, and pharmaceutically acceptable salts thereof. Certain aspects of the present invention are directed to a compound of Formula I:

or a pharmaceutically acceptable salt thereof, wherein each of R¹, R², and R³ is independently selected from CH₃, CH₂D, CHD₂, and CD₃; and each of Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b), Y^(5a), Y^(5b), Y^(6a), and Y^(6b) is independently selected from hydrogen and deuterium; provided that at least one of R¹, R², R³, Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b), Y^(5a), Y^(5b), Y^(6a), and Y^(6b) comprises deuterium.

This invention also provides pharmaceutical compositions comprising a compound of this invention, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. Certain aspects of the present invention are directed to the use of such compounds or pharmaceutical compositions in methods of treating diseases and conditions that are beneficially treated by administering an inhibitor of binding between an acetylated histone and a bromodomain-containing protein. Some exemplary embodiments include a method of treating a disease or condition selected from recurrent glioblastoma multiforme (GBM), hematological malignancies, acute leukemia, acute myeloid leukemia (AML), non-small cell lung cancer with rearranged ALK gene/fusion protein or KRAS Mutation, castrate-resistant prostate cancer (CRPC), and pancreatic ductal adenocarcinoma, comprising the step of administering to a subject in need thereof a compound or a pharmaceutical composition of the present invention. Other exemplary embodiments include a method of inhibiting binding between an acetylated histone and a bromodomain-containing protein in a cell, comprising contacting the cell with a compound or a pharmaceutical composition of the present invention.

DETAILED DESCRIPTION OF THE INVENTION Definitions

The term “treat” means decrease, suppress, attenuate, diminish, arrest, or stabilize the development or progression of a disease (e.g., a disease or disorder delineated herein), lessen the severity of the disease or improve the symptoms associated with the disease.

“Disease” means any condition or disorder that damages or interferes with the normal function of a cell, tissue, or organ.

It will be recognized that some variation of natural isotopic abundance occurs in a synthesized compound depending upon the origin of chemical materials used in the synthesis. Thus, a preparation of OTX-015 will inherently contain small amounts of deuterated isotopologues. The concentration of naturally abundant stable hydrogen and carbon isotopes, notwithstanding this variation, is small and immaterial as compared to the degree of stable isotopic substitution of compounds of this invention. See, for instance, Wada, E et al., Seikagaku, 1994, 66:15; Gannes, L Z et al., Comp Biochem Physiol Mol Integr Physiol, 1998, 119:725.

In the compounds of this invention any atom not specifically designated as a particular isotope is meant to represent any stable isotope of that atom. Unless otherwise stated, when a position is designated specifically as “H” or “hydrogen”, the position is understood to have hydrogen at its natural abundance isotopic composition. Also unless otherwise stated, when a position is designated specifically as “D” or “deuterium”, the position is understood to have deuterium at an abundance that is at least 3340 times greater than the natural abundance of deuterium, which is 0.015% (i.e., at least 50.1% incorporation of deuterium).

The term “isotopic enrichment factor” as used herein means the ratio between the isotopic abundance and the natural abundance of a specified isotope.

In other embodiments, a compound of this invention has an isotopic enrichment factor for each designated deuterium atom of at least 3500 (52.5% deuterium incorporation at each designated deuterium atom), at least 4000 (60% deuterium incorporation), at least 4500 (67.5% deuterium incorporation), at least 5000 (75% deuterium), at least 5500 (82.5% deuterium incorporation), at least 6000 (90% deuterium incorporation), at least 6333.3 (95% deuterium incorporation), at least 6466.7 (97% deuterium incorporation), at least 6600 (99% deuterium incorporation), or at least 6633.3 (99.5% deuterium incorporation).

The term “isotopologue” refers to a species in which the chemical structure differs from a specific compound of this invention only in the isotopic composition thereof.

The term “compound,” when referring to a compound of this invention, refers to a collection of molecules having an identical chemical structure, except that there may be isotopic variation among the constituent atoms of the molecules. Thus, it will be clear to those of skill in the art that a compound represented by a particular chemical structure containing indicated deuterium atoms, will also contain lesser amounts of isotopologues having hydrogen atoms at one or more of the designated deuterium positions in that structure. The relative amount of such isotopologues in a compound of this invention will depend upon a number of factors including the isotopic purity of deuterated reagents used to make the compound and the efficiency of incorporation of deuterium in the various synthesis steps used to prepare the compound.

The invention also provides salts of the compounds of the invention.

A salt of a compound of this invention is formed between an acid and a basic group of the compound, such as an amino functional group, or a base and an acidic group of the compound, such as a carboxyl functional group. According to another embodiment, the compound is a pharmaceutically acceptable acid addition salt.

The term “pharmaceutically acceptable,” as used herein, refers to a component that is, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and other mammals without undue toxicity, irritation, allergic response and the like, and are commensurate with a reasonable benefit/risk ratio. A “pharmaceutically acceptable salt” means any non-toxic salt that, upon administration to a recipient, is capable of providing, either directly or indirectly, a compound of this invention. A “pharmaceutically acceptable counterion” is an ionic portion of a salt that is not toxic when released from the salt upon administration to a recipient.

Acids commonly employed to form pharmaceutically acceptable salts include inorganic acids such as hydrogen bisulfide, hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid and phosphoric acid, as well as organic acids such as para-toluenesulfonic acid, salicylic acid, tartaric acid, bitartaric acid, ascorbic acid, maleic acid, besylic acid, fumaric acid, gluconic acid, glucuronic acid, formic acid, glutamic acid, methanesulfonic acid, ethanesulfonic acid, benzenesulfonic acid, lactic acid, oxalic acid, para-bromophenylsulfonic acid, carbonic acid, succinic acid, citric acid, benzoic acid and acetic acid, as well as related inorganic and organic acids. Such pharmaceutically acceptable salts thus include sulfate, pyrosulfate, bisulfate, sulfite, bisulfite, phosphate, monohydrogenphosphate, dihydrogenphosphate, metaphosphate, pyrophosphate, chloride, bromide, iodide, acetate, propionate, decanoate, caprylate, acrylate, formate, isobutyrate, caprate, heptanoate, propiolate, oxalate, malonate, succinate, suberate, sebacate, fumarate, maleate, butyne-1,4-dioate, hexyne-1,6-dioate, benzoate, chlorobenzoate, methylbenzoate, dinitrobenzoate, hydroxybenzoate, methoxybenzoate, phthalate, terephthalate, sulfonate, xylene sulfonate, phenylacetate, phenylpropionate, phenylbutyrate, citrate, lactate, β-hydroxybutyrate, glycolate, maleate, tartrate, methanesulfonate, propanesulfonate, naphthalene-1-sulfonate, naphthalene-2-sulfonate, mandelate and other salts. In one embodiment, pharmaceutically acceptable acid addition salts include those formed with mineral acids such as hydrochloric acid and hydrobromic acid, and especially those formed with organic acids such as maleic acid.

The pharmaceutically acceptable salt may also be a salt of a compound of the present invention having an acidic functional group, such as a carboxylic acid functional group, and a base. Exemplary bases include, but are not limited to, hydroxide of alkali metals including sodium, potassium, and lithium; hydroxides of alkaline earth metals such as calcium and magnesium; hydroxides of other metals, such as aluminum and zinc; ammonia, organic amines such as unsubstituted or hydroxyl-substituted mono-, di-, or tri-alkylamines, dicyclohexylamine; tributyl amine; pyridine; N-methyl, N-ethylamine; diethylamine; triethylamine; mono-, bis-, or tris-(2-OH—(C₁-C₆)-alkylamine), such as N,N-dimethyl-N-(2-hydroxyethyl)amine or tri-(2-hydroxyethyl)amine; N-methyl-D-glucamine; morpholine; thiomorpholine; piperidine; pyrrolidine; and amino acids such as arginine, lysine, and the like.

The compounds of the present invention (e.g., compounds of Formula I), may contain an asymmetric carbon atom, for example, as the result of deuterium substitution or otherwise. As such, compounds of this invention can exist as either individual enantiomers, or mixtures of the two enantiomers. Accordingly, a compound of the present invention may exist as either a racemic mixture or a scalemic mixture, or as individual respective stereoisomers that are substantially free from another possible stereoisomer. The term “substantially free of other stereoisomers” as used herein means less than 25% of other stereoisomers, preferably less than 10% of other stereoisomers, more preferably less than 5% of other stereoisomers and most preferably less than 2% of other stereoisomers are present. Methods of obtaining or synthesizing an individual enantiomer for a given compound are known in the art and may be applied as practicable to final compounds or to starting material or intermediates.

Unless otherwise indicated, when a disclosed compound is named or depicted by a structure without specifying the stereochemistry and has one or more chiral centers, it is understood to represent all possible stereoisomers of the compound.

The term “stable compounds,” as used herein, refers to compounds which possess stability sufficient to allow for their manufacture and which maintain the integrity of the compound for a sufficient period of time to be useful for the purposes detailed herein (e.g., formulation into therapeutic products, intermediates for use in production of therapeutic compounds, isolatable or storable intermediate compounds, treating a disease or condition responsive to therapeutic agents).

“D” and “d” both refer to deuterium. “Stereoisomer” refers to both enantiomers and diastereomers. “Tert” and “t-” each refer to tertiary. “US” refers to the United States of America.

“Substituted with deuterium” refers to the replacement of one or more hydrogen atoms with a corresponding number of deuterium atoms.

Throughout this specification, a variable may be referred to generally (e.g., “each R”) or may be referred to specifically (e.g., R¹, R², R³, etc.). Unless otherwise indicated, when a variable is referred to generally, it is meant to include all specific embodiments of that particular variable.

OTX-015 (CAS registry numbers 204587-26-8; 202590-98-5), also known as Y 803, (S)-2-[4-(4-chlorophenyl)-2,3,9-trimethyl-6H-thieno[3,2-f][1,2,4]triazolo[4,3-a]diazepin-6-yl]-N-(4-hydroxyphenyl)acetamide, inhibits binding between an acetylated histone and a bromodomain-containing protein (e.g. bromodomain and extraterminal domain (BET) family protein).

OTX-015 is currently in phase IIa clinical trials for the treatment of recurrent glioblastoma multiforme (GBM); phase IB clinical trials for the treatment of advanced solid tumors (i.e., BRD-NUT midline carcinoma, triple negative breast cancer, non-small cell lung cancer harboring a rearrangement ALK gene/fusion protein or KRAS mutation, castrate-resistant prostate cancer, and pancreatic ductal carcinoma); phase I clinical trials for the treatment of acute leukemia and other hematological malignancies; phase Ib/II clinical trials in combination with azacitidine for the treatment of acute myeloid leukemia (AML), and is currently being tested for safety and efficacy in patients with acute exacerbation of the aforementioned diseases.

Despite the beneficial activities of OTX-015, there is a continuing need for new compounds to treat the aforementioned diseases and conditions.

Therapeutic Compounds

The present invention provides a compound of Formula I:

or a pharmaceutically acceptable salt thereof,

-   -   wherein each of R¹, R², and R³ is independently selected from         CH₃, CH₂D, CHD₂, and CD₃; and     -   each of Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b),         Y^(5a), Y^(5b), Y^(6a), and Y^(6b) is independently selected         from hydrogen and deuterium;     -   provided that at least one of R¹, R², R³, Y¹, Y^(2a), Y^(2b),         Y^(3a), Y^(3b), Y^(4a), Y^(4b), Y^(5a), Y^(5b), Y^(6a) and         Y^(6b) comprises deuterium.

In some embodiments, R¹ is CD₃.

In some embodiments, R¹ is CHD₂.

In some embodiments, R¹ is CH₂D.

In some embodiments, R¹ is CH₃.

In some embodiments, R² and R³ are the same. In some aspects of these embodiments R² and R³ are each CD₃. In other aspects of these embodiments R² and R³ are each CH₂D. In further aspects of these embodiments R² and R³ are each CHD₂. In yet further aspects of these embodiments R² and R³ are each CH₃.

In some embodiments, R² is CD₃ and R³ is CHD₂.

In some embodiments, R² is CD₃ and R³ is CH₂D.

In some embodiments, R² is CD₃ and R³ is CH₃.

In some embodiments, R² is CHD₂ and R³ is CD₃.

In some embodiments, R² is CHD₂ and R³ is CH₂D.

In some embodiments, R² is CHD₂ and R³ is CH₃.

In some embodiments, R² is CH₂D and R³ is CD₃.

In some embodiments, R² is CH₂D and R³ is CHD₂.

In some embodiments, R² is CH₂D and R³ is CH₃.

In some embodiments, R² is CH₃ and R³ is CD₃.

In some embodiments, R² is CH₃ and R³ is CHD₂.

In some embodiments, R² is CH₃ and R³ is CH₂D.

In some embodiments, Y¹ is deuterium.

In some embodiments, Y¹ is hydrogen.

In some embodiments, Y^(2a) and Y^(2b) are the same. In some aspects of these embodiments, Y^(2a) and Y^(2b) are each deuterium. In other aspects of these embodiments, Y^(2a) and Y^(2b) are each hydrogen.

In some embodiments, Y^(2a) is deuterium and Y^(2b) is hydrogen.

In some embodiments, Y¹, Y^(2a) and Y^(2b) are the same. In some aspects of these embodiments, Y¹, Y^(2a) and Y^(2b) are each deuterium. In other aspects of these embodiments, Y¹, Y^(2a) and Y^(2b) are each hydrogen.

In some embodiments, Y¹ is deuterium, and Y^(2a) and Y^(2b) are each hydrogen. In other embodiments, Y¹ is hydrogen, and Y^(2a) and Y^(2b) are each deuterium.

In some embodiments, Y^(3a) and Y^(3b) are the same. In some aspects of these embodiments, Y^(3a) and Y^(3b) are each deuterium. In other aspects of these embodiments, Y^(3a) and Y^(3b) are each hydrogen.

In some embodiments, Y^(3a) is deuterium and Y^(3b) is hydrogen.

In some embodiments, Y^(4a) and Y^(4b) are the same. In some aspects of these embodiments, Y^(4a) and Y^(4b) are each deuterium. In other aspects of these embodiments, Y^(4a) and Y^(4b) are each hydrogen.

In some embodiments, Y^(4a) is deuterium and Y^(4b) is hydrogen.

In some embodiments, Y^(3a) and Y^(3b) are each deuterium, and Y^(4a) and Y^(4b) are each hydrogen. In other embodiments, Y^(3a) and Y^(3b) are each hydrogen, and Y^(4a) and Y^(4b) are each deuterium.

In some embodiments, Y^(3a), Y^(3b), Y^(4a), and Y^(4b) are the same. In some aspects of these embodiments, Y^(3a), Y^(3b), Y^(4a), and Y^(4b) are each deuterium. In other aspects of these embodiments, Y^(3a), Y^(3b), Y^(4a), and Y^(4b) are each hydrogen.

In some embodiments, Y^(3a) and Y^(4a) are each deuterium, and Y^(3b) and Y^(4b) are each hydrogen. In other embodiments, Y^(3a) and Y^(4a) are each hydrogen, and Y^(3b) and Y^(4b) are each deuterium.

In some embodiments, Y^(5a) and Y^(5b) are the same. In some aspects of these embodiments, Y^(5a) and Y^(5b) are each deuterium. In other aspects of these embodiments, Y^(5a) and Y^(5b) are each hydrogen.

In some embodiments, Y^(5a) is deuterium and Y^(5b) is hydrogen.

In some embodiments, Y^(6a) and Y^(6b) are the same. In some aspects of these embodiments, Y^(6a) and Y^(6b) are each deuterium. In other aspects of these embodiments, Y^(6a) and Y^(6b) are each hydrogen.

In some embodiments, Y^(6a) is deuterium and Y^(6b) is hydrogen.

In some embodiments, Y^(5a), Y^(5b), Y^(6a), and Y^(6b) are the same. In some aspects of these embodiments, Y^(5a), Y^(5b), Y^(6a), and Y^(6b) are each deuterium. In other aspects of these embodiments, Y^(5a), Y^(5b), Y^(6a), and Y^(6b) are each hydrogen.

In some embodiments, Y^(5a) and Y^(6a) are each deuterium, and Y^(5b) and Y^(6b) are each hydrogen. In other embodiments, Y^(5a) and Y^(6a) are each hydrogen, and Y^(5b) and Y^(6b) are each deuterium.

In one embodiment, R² and R³ are the same, Y¹, Y^(2a), and Y^(2b) are each deuterium; and the compound is selected from any one of the compounds (Cmpd) set forth in Table 1a (below):

TABLE 1a Exemplary Embodiments of Formula I Cmpd R¹ R²/R³ Y^(3a) Y^(3b) Y^(4a) Y^(4b) Y^(5a) Y^(5b) Y^(6a) Y^(6b) 101a CD₃ CD₃ H D H D H D H D 102a CD₃ CD₃ D H D H D H D H 103a CH₃ CD₃ H D H D H D H D 104a CH₃ CD₃ D H D H D H D H 105a CD₃ CH₃ H D H D H D H D 106a CD₃ CH₃ D H D H D H D H 107a CH₃ CH₃ H D H D H D H D 108a CH₃ CH₃ D H D H D H D H 109a CHD₂ CHD₂ H D H D H D H D 110a CHD₂ CHD₂ D H D H D H D H 111a CHD₂ CHD₂ H H D D H H D D 112a CHD₂ CHD₂ D D H H D D H H 113a CH₂D CH₂D H D H D H D H D 114a CH₂D CH₂D D H D H D H D H 115a CH₂D CH₂D H H D D H H D D 116a CH₂D CH₂D D D H H D D H H 117a CHD₂ CD₃ H H D D H H D D 118a CHD₂ CD₃ D D H H D D H H 119a CHD₂ CD₃ H D H D H D H D 120a CHD₂ CD₃ D H D H D H D H 121a CD₃ CHD₂ H H D D H H D D 122a CD₃ CHD₂ D D H H D D H H 123a CD₃ CHD₂ H D H D H D H D 124a CD₃ CHD₂ D H D H D H D H 125a CH₃ CHD₂ H H D D H H D D 126a CH₃ CHD₂ D D H H D D H H 127a CH₃ CHD₂ H D H D H D H D 128a CH₃ CHD₂ D H D H D H D H 129a CHD₂ CH₃ H H D D H H D D 130a CHD₂ CH₃ D D H H D D H H 131a CHD₂ CH₃ H D H D H D H D 132a CHD₂ CH₃ D H D H D H D H 133a CH₂D CHD₂ H H D D H H D D 134a CH₂D CHD₂ D D H H D D H H 135a CH₂D CHD₂ H D H D H D H D 136a CH₂D CHD₂ D H D H D H D H 137a CHD₂ CH₂D H H D D H H D D 138a CHD₂ CH₂D D D H H D D H H 139a CHD₂ CH₂D H D H D H D H D 140a CHD₂ CH₂D D H D H D H D H 141a CH₂D CD₃ H H D D H H D D 142a CH₂D CD₃ D D H H D D H H 143a CH₂D CD₃ H D H D H D H D 144a CH₂D CD₃ D H D H D H D H 145a CD₃ CH₂D H H D D H H D D 146a CD₃ CH₂D D D H H D D H H 147a CD₃ CH₂D H D H D H D H D 148a CD₃ CH₂D D H D H D H D H 149a CH₂D CH₃ H H D D H H D D 150a CH₂D CH₃ D D H H D D H H 151a CH₂D CH₃ H D H D H D H D 152a CH₂D CH₃ D H D H D H D H 153a CH₃ CH₂D H H D D H H D D 154a CH₃ CH₂D D D H H D D H H 155a CH₃ CH₂D H D H D H D H D 156a CH₃ CH₂D D H D H D H D H, or a pharmaceutically acceptable salt thereof, wherein any atom not designated as deuterium is present at its natural isotopic abundance.

In one embodiment Y^(3a), Y^(3b), Y^(4a), and Y^(4b) are each deuterium, and Y^(5a), Y^(5b), Y^(6a), and Y^(6b) are each hydrogen; and the compound is selected from any one of the compounds (Cmpd) set forth in Table 1b (below):

TABLE 1b Exemplary Embodiments of Formula I Cmpd R¹ R² R³ Y¹ Y^(2a) Y^(2b) 101b CD₃ CH₃ CD₃ D H D 102b CD₃ CH₃ CD₃ H D H 103b CHD₂ CH₃ CD₃ D H D 104b CHD₂ CH₃ CD₃ H D H 105b CH₂D CH₃ CD₃ D H D 106b CH₂D CH₃ CD₃ H D H 107b CD₃ CD₃ CH₃ D H D 108b CD₃ CD₃ CH₃ H D H 109b CHD₂ CD₃ CH₃ D H D 110b CHD₂ CD₃ CH₃ H D H 111b CH₂D CD₃ CH₃ D H D 112b CH₂D CD₃ CH₃ H D H 113b CD₃ CHD₂ CH₃ D H D 114b CD₃ CHD₂ CH₃ H D H 115b CHD₂ CHD₂ CH₃ D H D 116b CHD₂ CHD₂ CH₃ H D H 117b CH₂D CHD₂ CH₃ D H D 118b CH₂D CHD₂ CH₃ H D H 119b CD₃ CH₃ CHD₂ D H D 120b CD₃ CH₃ CHD₂ H D H 121b CHD₂ CH₃ CHD₂ D H D 122b CHD₂ CH₃ CHD₂ H D H 123b CH₂D CH₃ CHD₂ D H D 124b CH₂D CH₃ CHD₂ H D H 125b CD₃ CH₂D CH₃ D H D 126b CD₃ CH₂D CH₃ H D H 127b CHD₂ CH₂D CH₃ D H D 128b CHD₂ CH₂D CH₃ H D H 129b CH₂D CH₂D CH₃ D H D 130b CH₂D CH₂D CH₃ H D H 131b CD₃ CH₃ CH₂D D H D 132b CD₃ CH₃ CH₂D H D H 133b CHD₂ CH₃ CH₂D D H D 134b CHD₂ CH₃ CH₂D H D H 135b CH₂D CH₃ CH₂D D H D 136b CH₂D CH₃ CH₂D H D H 137b CD₃ CH₂D CHD₂ D H D 138b CD₃ CH₂D CHD₂ H D H 139b CHD₂ CH₂D CHD₂ D H D 140b CHD₂ CH₂D CHD₂ H D H 141b CH₂D CH₂D CHD₂ D H D 142b CH₂D CH₂D CHD₂ H D H 143b CD₃ CHD₂ CH₂D D H D 144b CD₃ CHD₂ CH₂D H D H 145b CHD₂ CHD₂ CH₂D D H D 146b CHD₂ CHD₂ CH₂D H D H 147b CH₂D CHD₂ CH₂D D H D 148b CH₂D CHD₂ CH₂D H D H, or a pharmaceutically acceptable salt thereof, wherein any atom not designated as deuterium is present at its natural isotopic abundance.

In one embodiment Y^(3a), Y^(3b), Y^(4a), and Y^(4b) are each hydrogen, and Y^(5a), Y^(5b), Y^(6a), and Y^(6b) are each deuterium; and the compound is selected from any one of the compounds (Cmpd) set forth in Table 1c (below):

TABLE 1c Exemplary Embodiments of Formula I Cmpd R¹ R² R³ Y¹ Y^(2a) Y^(2b) 101c CD₃ CH₃ CD₃ D H D 102c CD₃ CH₃ CD₃ H D H 103c CHD₂ CH₃ CD₃ D H D 104c CHD₂ CH₃ CD₃ H D H 105c CH₂D CH₃ CD₃ D H D 106c CH₂D CH₃ CD₃ H D H 107c CD₃ CD₃ CH₃ D H D 108c CD₃ CD₃ CH₃ H D H 109c CHD₂ CD₃ CH₃ D H D 110c CHD₂ CD₃ CH₃ H D H 111c CH₂D CD₃ CH₃ D H D 112c CH₂D CD₃ CH₃ H D H 113c CD₃ CHD₂ CH₃ D H D 114c CD₃ CHD₂ CH₃ H D H 115c CHD₂ CHD₂ CH₃ D H D 116c CHD₂ CHD₂ CH₃ H D H 117c CH₂D CHD₂ CH₃ D H D 118c CH₂D CHD₂ CH₃ H D H 119c CD₃ CH₃ CHD₂ D H D 120c CD₃ CH₃ CHD₂ H D H 121c CHD₂ CH₃ CHD₂ D H D 122c CHD₂ CH₃ CHD₂ H D H 123c CH₂D CH₃ CHD₂ D H D 124c CH₂D CH₃ CHD₂ H D H 125c CD₃ CH₂D CH₃ D H D 126c CD₃ CH₂D CH₃ H D H 127c CHD₂ CH₂D CH₃ D H D 128c CHD₂ CH₂D CH₃ H D H 129c CH₂D CH₂D CH₃ D H D 130c CH₂D CH₂D CH₃ H D H 131c CD₃ CH₃ CH₂D D H D 132c CD₃ CH₃ CH₂D H D H 133c CHD₂ CH₃ CH₂D D H D 134c CHD₂ CH₃ CH₂D H D H 135c CH₂D CH₃ CH₂D D H D 136c CH₂D CH₃ CH₂D H D H 137c CD₃ CH₂D CHD₂ D H D 138c CD₃ CH₂D CHD₂ H D H 139c CHD₂ CH₂D CHD₂ D H D 140c CHD₂ CH₂D CHD₂ H D H 141c CH₂D CH₂D CHD₂ D H D 142c CH₂D CH₂D CHD₂ H D H 143c CD₃ CHD₂ CH₂D D H D 144c CD₃ CHD₂ CH₂D H D H 145c CHD₂ CHD₂ CH₂D D H D 146c CHD₂ CHD₂ CH₂D H D H 147c CH₂D CHD₂ CH₂D D H D 148c CH₂D CHD₂ CH₂D H D H, or a pharmaceutically acceptable salt thereof, wherein any atom not designated as deuterium is present at its natural isotopic abundance.

In some embodiments, each of R¹, R², and R³ is independently selected from CH₃ and CD₃; Y^(2a), and Y^(2b) are the same; Y^(3a) and Y^(3b) are the same; Y^(4a) and Y^(4b) are the same; Y^(5a) and Y^(5b) are the same; and Y^(6a) and Y^(6b) are the same. In some aspects of these embodiments, R¹ is CD₃. In other aspects of these embodiments, R¹ is CH₃. In further aspects of these embodiments, R² and R³ are each CD₃. In further aspects of these embodiments, R² and R³ are each CH₃. In further aspects of these embodiments, R² is CD₃ and R³ is CH₃. In further aspects of these embodiments, Y¹ is deuterium. In further aspects of these embodiments, Y¹ is hydrogen. In further aspects embodiments, Y^(2a) and Y^(2b) are each deuterium. In further aspects embodiments, Y^(2a) and Y^(2b) are each hydrogen. In further aspects embodiments, Y^(3a) and Y^(3b) are each deuterium. In further aspects embodiments, Y^(3a) and Y^(3b) are each hydrogen. In further aspects embodiments, Y^(4a) and Y^(4b) are each deuterium. In further aspects embodiments, Y^(4a) and Y^(4b) are each hydrogen. In further aspects embodiments, Y^(5a) and Y^(5b) are each deuterium. In further aspects embodiments, Y^(5a) and Y^(5b) are each hydrogen. In further aspects embodiments, Y^(6a) and Y^(6b) are each deuterium. In yet further aspects embodiments, Y^(6a) and Y^(6b) are each hydrogen.

In one embodiment, each of R¹, R², and R³ is independently selected from CH₃ and CD₃; Y^(2a), and Y^(2b) are the same; Y^(3a) and Y^(3b) are the same; Y^(4a) and Y^(4b) are the same; Y^(5a) and Y^(5b) are the same; Y^(6a) and Y^(6b) are the same; and the compound is selected from any one of the compounds (Cmpd) set forth in Table 2 (below):

TABLE 2 Exemplary Embodiments of Formula I Y^(3a)/ Y^(4a)/ Y^(5a)/ Y^(6a)/ Cmpd R¹ R² R³ Y¹ Y^(2a)/Y^(2b) Y^(3b) Y^(4b) Y^(5b) Y^(6b) 201 CD₃ CD₃ CD₃ D D D D D D 202 CD₃ CD₃ CD₃ H D D D D D 203 CD₃ CD₃ CD₃ D H D D D D 204 CD₃ CD₃ CD₃ H H D D D D 205 CD₃ CD₃ CD₃ D D H D D D 206 CD₃ CD₃ CD₃ D D D D H D 207 CD₃ CD₃ CD₃ D D H H D D 208 CD₃ CD₃ CD₃ D D D D H H 209 CD₃ CD₃ CD₃ D D H H H H 210 CD₃ CD₃ CD₃ H H H H H H 211 CD₃ CH₃ CH₃ D D D D D D 212 CD₃ CH₃ CH₃ H D D D D D 213 CD₃ CH₃ CH₃ D H D D D D 214 CD₃ CH₃ CH₃ H H D D D D 215 CD₃ CH₃ CH₃ D D H D D D 216 CD₃ CH₃ CH₃ D D D D H D 217 CD₃ CH₃ CH₃ D D H H D D 218 CD₃ CH₃ CH₃ D D D D H H 219 CD₃ CH₃ CH₃ D D H H H H 220 CD₃ CH₃ CH₃ H H H H H H 221 CH₃ CD₃ CD₃ D D D D D D 222 CH₃ CD₃ CD₃ H D D D D D 223 CH₃ CD₃ CD₃ D H D D D D 224 CH₃ CD₃ CD₃ H H D D D D 225 CH₃ CD₃ CD₃ D D H D D D 226 CH₃ CD₃ CD₃ D D D D H D 227 CH₃ CD₃ CD₃ D D H H D D 228 CH₃ CD₃ CD₃ D D D D H H 229 CH₃ CD₃ CD₃ D D H H H H 230 CH₃ CD₃ CD₃ H H H H H H 231 CD₃ CH₃ CD₃ D D D D D D 232 CD₃ CH₃ CD₃ H D D D D D 233 CD₃ CH₃ CD₃ D H D D D D 234 CD₃ CH₃ CD₃ H H D D D D 235 CD₃ CH₃ CD₃ D D H D D D 236 CD₃ CH₃ CD₃ D D D D H D 237 CD₃ CH₃ CD₃ D D H H D D 238 CD₃ CH₃ CD₃ D D D D H H 239 CD₃ CH₃ CD₃ D D H H H H 240 CD₃ CH₃ CD₃ H H H H H H 241 CH₃ CD₃ CH₃ D D D D D D 242 CH₃ CD₃ CH₃ H D D D D D 243 CH₃ CD₃ CH₃ D H D D D D 244 CH₃ CD₃ CH₃ H H D D D D 245 CH₃ CD₃ CH₃ D D H D D D 246 CH₃ CD₃ CH₃ D D D D H D 247 CH₃ CD₃ CH₃ D D H H D D 248 CH₃ CD₃ CH₃ D D D D H H 249 CH₃ CD₃ CH₃ D D H H H H 250 CH₃ CD₃ CH₃ H H H H H H 251 CD₃ CD₃ CH₃ D D D D D D 252 CD₃ CD₃ CH₃ H D D D D D 253 CD₃ CD₃ CH₃ D H D D D D 254 CD₃ CD₃ CH₃ H H D D D D 255 CD₃ CD₃ CH₃ D D H D D D 256 CD₃ CD₃ CH₃ D D D D H D 257 CD₃ CD₃ CH₃ D D H H D D 258 CD₃ CD₃ CH₃ D D D D H H 259 CD₃ CD₃ CH₃ D D H H H H 260 CD₃ CD₃ CH₃ H H H H H H 261 CH₃ CH₃ CD₃ D D D D D D 262 CH₃ CH₃ CD₃ H D D D D D 263 CH₃ CH₃ CD₃ D H D D D D 264 CH₃ CH₃ CD₃ H H D D D D 265 CH₃ CH₃ CD₃ D D H D D D 266 CH₃ CH₃ CD₃ D D D D H D 267 CH₃ CH₃ CD₃ D D H H D D 268 CH₃ CH₃ CD₃ D D D D H H 269 CH₃ CH₃ CD₃ D D H H H H 270 CH₃ CH₃ CD₃ H H H H H H 271 CH₃ CH₃ CH₃ D D D D D D 272 CH₃ CH₃ CH₃ H D D D D D 273 CH₃ CH₃ CH₃ D H D D D D 274 CH₃ CH₃ CH₃ H H D D D D 275 CH₃ CH₃ CH₃ D D H D D D 276 CH₃ CH₃ CH₃ D D D D H D 277 CH₃ CH₃ CH₃ D D H H D D 278 CH₃ CH₃ CH₃ D D D D H H, or a pharmaceutically acceptable salt thereof, wherein any atom not designated as deuterium is present at its natural isotopic abundance.

In one embodiment of a compound of Formula I, the compound is not a compound wherein each of Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b), Y^(5a), Y^(5b), Y^(6a), and Y^(6b) is deuterium, and each of R¹, R², and R³ is CD₃.

The following intermediates are novel and fall within the scope of this invention:

wherein R², R³, Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b) are as defined above. In certain embodiments, at least one of R², R³, Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a) and Y^(4b) comprises deuterium.

In another set of embodiments, any atom not designated as deuterium in any of the embodiments set forth above is present at its natural isotopic abundance.

The synthesis of compounds of Formula I may be readily achieved by synthetic chemists of ordinary skill by reference to the Exemplary Synthesis and Examples disclosed herein. Relevant procedures analogous to those of use for the preparation of compounds of Formula I and intermediates thereof are disclosed, for instance in U.S. Pat. No. 5,712,274; or EP patent No. 989,131; or U.S. Pat. No. 8,476,260; or US patent application publication No. 20140107107; or PCT application No. PCT/EP13/63313 (published as WO 2014/001356); or U.S. Pat. No. 8,883,777; or PCT application No. PCT/US14/23386 (published as WO2014/159392); or PCT application No. PCT/US11/36701 (published as WO2011/143669).

Such methods can be carried out utilizing corresponding deuterated and optionally, other isotope-containing reagents and/or intermediates to synthesize the compounds delineated herein, or invoking standard synthetic protocols known in the art for introducing isotopic atoms to a chemical structure.

Exemplary Synthesis

A convenient method for synthesizing compounds of Formula I and/or novel intermediates is depicted in Scheme 1 below:

wherein R¹, R², R³, Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b), Y^(5a), Y^(5b), Y^(6a), and Y^(6b) are as defined above. Reagents and conditions: (a) Sulfur, Morpholine; (b) PyBOP, DIEA; (c) Piperidine; (d) SiO₂, heat; (e) t-BuOK, Diethyl chlorophosphate; (f) TFA; (g) Pivaloyl chloride, TEA.

In a manner analogous to a procedure described in PCT application No. PCT/US11/36701 (published as WO2011/143669) and EP patent No. 989,131, multi-component cyclocondensation Gewald reaction between sulfur, appropriately deuterated β-ketonitrile intermediate (1) and ketone (2) affords aminothiophene intermediate (3), which is subsequently coupled with appropriately deuterated and protected amino acid (4) in the presence of amide bond forming reagent such as benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate (PyBOP) and N,N-diisopropylethylamine (DIEA) to furnish appropriately deuterated amide intermediate (5). Deprotection of amino protecting group affords appropriately deuterated free amine intermediate (6), which cyclizes upon heating in a suitable solvent in the presence of a dehydrating agent such as silica to furnish thienodiazepinone intermediate (7). Activation of the lactam of diazepinone intermediate (7) by conversion to the phosphorylimidate and subsequent treatment with appropriately deuterated acylhydrazine intermediate (8) affords corresponding protected deuterated triazolo intermediate (9). Deprotection of intermediate (9) with acid such as trifluoroacetic acid (TFA), affords appropriately deuterated carboxylic acid (10) which is subsequently activated with pivaloyl chloride and treated with appropriately deuterated aniline intermediate (11) to furnish compounds of Formula I.

Using commercially available reagents and deuterated reagents that can be readily prepared by known methods, compounds of Formula I can be prepared with greater than 90% or greater than 95% deuterium incorporation at each position designated as D (see below for details).

Appropriately deuterated intermediate (1), for use in the preparation of compounds of Formula I according to Scheme 1, may be prepared from corresponding deuterated reagents depicted in Scheme 2.

wherein Y^(3a), Y^(3b), Y^(4a), and Y^(4b) are as defined. Reagents and conditions: (a) CuCl₂; (b) MeOH, POCl₃; (c) NaOMe, Citric acid, H₂O

In a manner analogous to a procedure described by Oae, S. et al., Bulletin of the Chemical Society of Japan, 53(4), 1065-9; 1980, appropriately deuterated amino benzoic acid (12) is treated with CuCl₂ to afford corresponding chloro benzoic acid intermediate (13), which is subsequently esterified at low temperature in the presence of MeOH and POCl₃ to furnish methyl ester (14) in a manner analogous to a procedure described by Patila, P. et al., Pharma Chemica, 6(5), 365-369, 2014. The resulting ester intermediate (14) is subsequently treated with sodium methoxide in dry, refluxing acetonitrile (15) to afford appropriately deuterated β-ketonitrile intermediate (1), in a manner analogous to a procedure described by Ma, L., et al., Synthesis, 45(1), 45-52; 2013.

The following intermediates (2a-c), (4a-c), (8a), (11a-c), (12a-c) are accessible from various commercial sources or these intermediates can be readily prepared according to previously published protocols as described below. Intermediates of general formulae (2), (4), (8), (11), (12), wherein R¹, R², R³, Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b), Y^(5a), Y^(5b), Y^(6a), and Y^(6b) are as defined hereinbefore, can be obtained from similar commercial sources, or synthetically prepared using procedures similar to those used for the preparation of (2a-c), (4a-c), (8a), (11a-c), (12a-c).

Intermediate (2)

The following appropriately deuterated starting materials for use as intermediate (2) are commercially available: 2-Butanone-d₈ (98 atom % D), (2a); 2-Butanone-4,4,4-d₃ (99 atom % D), (2b), and 2-Butanone-1,1,1,3,3-d₅ (98 atom % D), (2c).

Intermediate (4)

Appropriately deuterated intermediate (4) is prepared in a manner analogous to a procedure described by Wang, J., et al., Chemical & Pharmaceutical Bulletin, 44(11), 2189-2191; 1996. Appropriately deuterated amino acids used for the preparation of intermediate (4) are prepared accordingly: (4a), L-Aspartic acid-d₇ (98 atom % D) is commercially available, intermediate (4b) is prepared as described by Zhang, S., et al., Journal of Peptide Research (2000), 55(1), 1-6, and intermediate (4c) is prepared as described by Rose, J. et al., Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry, (2), 157-65; 1995.

Intermediate (8)

Appropriately deuterated intermediate (8a) is prepared in accordance with a procedure described in WO 2010014236 from Acetyl chloride-d3 (99 atom % D) and Hydrazine.

Intermediate (11)

Appropriately deuterated intermediate (11a) is prepared in accordance with a procedure described by Vaidyanathan, S., Tetrahedron Letters, 46(31), 5195-5197, 2005; intermediate (11b) is prepared as described by Lichtenecker, R., et al., Organic & Biomolecular Chemistry (2014), 12(38), 7551-7560, and intermediate (11c) is prepared as described in WO 2011091035.

Intermediate (12)

The following appropriately deuterated amino benzoic acid starting materials are commercially available: 4-Aminobenzoic-2,3,5,6-d₄ acid (98 atom % D) (12a), and 4-Aminobenzoic-2,6-d₂ acid (95 atom % D) (12b), and intermediate (12c) is prepared as described by Lockley, W. et al., Journal of Labelled Compounds and Radiopharmaceuticals, 53(11-12), 668-673; 2010.

The specific approaches and compounds shown above are not intended to be limiting. The chemical structures in the schemes herein depict variables that are hereby defined commensurately with chemical group definitions (moieties, atoms, etc.) of the corresponding position in the compound formulae herein, whether identified by the same variable name (i.e., R¹, R², R³, etc.) or not. The suitability of a chemical group in a compound structure for use in the synthesis of another compound is within the knowledge of one of ordinary skill in the art.

Additional methods of synthesizing compounds of Formula I and their synthetic precursors, including those within routes not explicitly shown in schemes herein, are within the means of chemists of ordinary skill in the art. Synthetic chemistry transformations and protecting group methodologies (protection and deprotection) useful in synthesizing the applicable compounds are known in the art and include, for example, those described in Larock R, Comprehensive Organic Transformations, VCH Publishers (1989); Greene, T W et al., Protective Groups in Organic Synthesis, 3^(rd) Ed., John Wiley and Sons (1999); Fieser, L et al., Fieser and Fieser's Reagents for Organic Synthesis, John Wiley and Sons (1994); and Paquette, L, ed., Encyclopedia of Reagents for Organic Synthesis, John Wiley and Sons (1995) and subsequent editions thereof.

Combinations of substituents and variables envisioned by this invention are only those that result in the formation of stable compounds.

Pharmaceutical Compositions

The invention also provides pharmaceutical compositions comprising an effective amount of a compound of Formula I (e.g., including any of the formulae herein), or a pharmaceutically acceptable salt of said compound; and a pharmaceutically acceptable carrier. The carrier(s) are “acceptable” in the sense of being compatible with the other ingredients of the formulation and, in the case of a pharmaceutically acceptable carrier, not deleterious to the recipient thereof in an amount used in the medicament.

Pharmaceutically acceptable carriers, adjuvants, excipients, and vehicles that may be used in the pharmaceutical compositions of this invention include, but are not limited to, ion exchangers, alumina, aluminum stearate, lecithin, serum proteins, such as human serum albumin, buffer substances such as phosphates, glycine, sorbic acid, potassium sorbate, partial glyceride mixtures of saturated vegetable fatty acids, water, salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc salts, colloidal silica, magnesium trisilicate, polyvinyl pyrrolidone, cellulose-based substances, polyethylene glycol, sodium carboxymethylcellulose, polyacrylates, waxes, polyethylene-polyoxypropylene-block polymers, polyethylene glycol and wool fat.

If required, the solubility and bioavailability of the compounds of the present invention in pharmaceutical compositions may be enhanced by methods well-known in the art. One method includes the use of lipid excipients in the formulation. See “Oral Lipid-Based Formulations: Enhancing the Bioavailability of Poorly Water-Soluble Drugs (Drugs and the Pharmaceutical Sciences),” David J. Hauss, ed. Informa Healthcare, 2007; and “Role of Lipid Excipients in Modifying Oral and Parenteral Drug Delivery: Basic Principles and Biological Examples,” Kishor M. Wasan, ed. Wiley-Interscience, 2006.

Another known method of enhancing bioavailability is the use of an amorphous form of a compound of this invention optionally formulated with a poloxamer, such as LUTROL™ and PLURONIC™ (BASF Corporation), or block copolymers of ethylene oxide and propylene oxide. See U.S. Pat. No. 7,014,866; and United States patent publications 20060094744 and 20060079502.

The pharmaceutical compositions of the invention include those suitable for oral, rectal, nasal, topical (including buccal and sublingual), vaginal or parenteral (including subcutaneous, intramuscular, intravenous and intradermal) administration. In certain embodiments, the compound of the formulae herein is administered transdermally (e.g., using a transdermal patch or iontophoretic techniques). Other formulations may conveniently be presented in unit dosage form, e.g., tablets, sustained release capsules, and in liposomes, and may be prepared by any methods well known in the art of pharmacy. See, for example, Remington: The Science and Practice of Pharmacy, Lippincott Williams & Wilkins, Baltimore, Md. (20th ed. 2000).

Such preparative methods include the step of bringing into association with the molecule to be administered ingredients such as the carrier that constitutes one or more accessory ingredients. In general, the compositions are prepared by uniformly and intimately bringing into association the active ingredients with liquid carriers, liposomes or finely divided solid carriers, or both, and then, if necessary, shaping the product.

In certain embodiments, the compound is administered orally. Compositions of the present invention suitable for oral administration may be presented as discrete units such as capsules, sachets, or tablets each containing a predetermined amount of the active ingredient; a powder or granules; a solution or a suspension in an aqueous liquid or a non-aqueous liquid; an oil-in-water liquid emulsion; a water-in-oil liquid emulsion; packed in liposomes; or as a bolus, etc. Soft gelatin capsules can be useful for containing such suspensions, which may beneficially increase the rate of compound absorption.

In the case of tablets for oral use, carriers that are commonly used include lactose and corn starch. Lubricating agents, such as magnesium stearate, are also typically added. For oral administration in a capsule form, useful diluents include lactose and dried cornstarch. When aqueous suspensions are administered orally, the active ingredient is combined with emulsifying and suspending agents. If desired, certain sweetening and/or flavoring and/or coloring agents may be added.

Compositions suitable for oral administration include lozenges comprising the ingredients in a flavored basis, usually sucrose and acacia or tragacanth; and pastilles comprising the active ingredient in an inert basis such as gelatin and glycerin, or sucrose and acacia.

Compositions suitable for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain anti-oxidants, buffers, bacteriostats and solutes which render the formulation isotonic with the blood of the intended recipient; and aqueous and non-aqueous sterile suspensions which may include suspending agents and thickening agents. The formulations may be presented in unit-dose or multi-dose containers, for example, sealed ampules and vials, and may be stored in a freeze dried (lyophilized) condition requiring only the addition of the sterile liquid carrier, for example water for injections, immediately prior to use. Extemporaneous injection solutions and suspensions may be prepared from sterile powders, granules and tablets.

Such injection solutions may be in the form, for example, of a sterile injectable aqueous or oleaginous suspension. This suspension may be formulated according to techniques known in the art using suitable dispersing or wetting agents (such as, for example, Tween 80) and suspending agents. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally-acceptable diluent or solvent, for example, as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are mannitol, water, Ringer's solution and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose, any bland fixed oil may be employed including synthetic mono- or diglycerides. Fatty acids, such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically-acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions. These oil solutions or suspensions may also contain a long-chain alcohol diluent or dispersant.

The pharmaceutical compositions of this invention may be administered in the form of suppositories for rectal administration. These compositions can be prepared by mixing a compound of this invention with a suitable non-irritating excipient which is solid at room temperature but liquid at the rectal temperature and therefore will melt in the rectum to release the active components. Such materials include, but are not limited to, cocoa butter, beeswax and polyethylene glycols.

The pharmaceutical compositions of this invention may be administered by nasal aerosol or inhalation. Such compositions are prepared according to techniques well-known in the art of pharmaceutical formulation and may be prepared as solutions in saline, employing benzyl alcohol or other suitable preservatives, absorption promoters to enhance bioavailability, fluorocarbons, and/or other solubilizing or dispersing agents known in the art. See, e.g.: Rabinowitz J D and Zaffaroni A C, U.S. Pat. No. 6,803,031, assigned to Alexza Molecular Delivery Corporation.

Topical administration of the pharmaceutical compositions of this invention is especially useful when the desired treatment involves areas or organs readily accessible by topical application. For topical application topically to the skin, the pharmaceutical composition should be formulated with a suitable ointment containing the active components suspended or dissolved in a carrier. Carriers for topical administration of the compounds of this invention include, but are not limited to, mineral oil, liquid petroleum, white petroleum, propylene glycol, polyoxyethylene polyoxypropylene compound, emulsifying wax, and water. Alternatively, the pharmaceutical composition can be formulated with a suitable lotion or cream containing the active compound suspended or dissolved in a carrier. Suitable carriers include, but are not limited to, mineral oil, sorbitan monostearate, polysorbate 60, cetyl esters wax, cetearyl alcohol, 2-octyldodecanol, benzyl alcohol, and water. The pharmaceutical compositions of this invention may also be topically applied to the lower intestinal tract by rectal suppository formulation or in a suitable enema formulation. Topically-transdermal patches and iontophoretic administration are also included in this invention.

Application of the subject therapeutics may be local, so as to be administered at the site of interest. Various techniques can be used for providing the subject compositions at the site of interest, such as injection, use of catheters, trocars, projectiles, pluronic gel, stents, sustained drug release polymers or other device which provides for internal access.

Thus, according to yet another embodiment, the compounds of this invention may be incorporated into compositions for coating an implantable medical device, such as prostheses, artificial valves, vascular grafts, stents, or catheters. Suitable coatings and the general preparation of coated implantable devices are known in the art and are exemplified in U.S. Pat. Nos. 6,099,562; 5,886,026; and 5,304,121. The coatings are typically biocompatible polymeric materials such as a hydrogel polymer, polymethyldisiloxane, polycaprolactone, polyethylene glycol, polylactic acid, ethylene vinyl acetate, and mixtures thereof. The coatings may optionally be further covered by a suitable topcoat of fluorosilicone, polysaccharides, polyethylene glycol, phospholipids or combinations thereof to impart controlled release characteristics in the composition. Coatings for invasive devices are to be included within the definition of pharmaceutically acceptable carrier, adjuvant or vehicle, as those terms are used herein.

According to another embodiment, the invention provides a method of coating an implantable medical device comprising the step of contacting said device with the coating composition described above. It will be obvious to those skilled in the art that the coating of the device will occur prior to implantation into a mammal.

According to another embodiment, the invention provides a method of impregnating an implantable drug release device comprising the step of contacting said drug release device with a compound or composition of this invention. Implantable drug release devices include, but are not limited to, biodegradable polymer capsules or bullets, non-degradable, diffusible polymer capsules and biodegradable polymer wafers.

According to another embodiment, the invention provides an implantable medical device coated with a compound or a composition comprising a compound of this invention, such that said compound is therapeutically active.

According to another embodiment, the invention provides an implantable drug release device impregnated with or containing a compound or a composition comprising a compound of this invention, such that said compound is released from said device and is therapeutically active.

Where an organ or tissue is accessible because of removal from the subject, such organ or tissue may be bathed in a medium containing a composition of this invention, a composition of this invention may be painted onto the organ, or a composition of this invention may be applied in any other convenient way.

In another embodiment, a composition of this invention further comprises a second therapeutic agent. The second therapeutic agent may be selected from any compound or therapeutic agent known to have or that demonstrates advantageous properties when administered with a compound having the same mechanism of action as OTX-015. Such agents include those indicated as being useful in combination with OTX-015, including but not limited to, those described in PCT application No. PCT/US13/46485 (published as WO2013/192274); or PCT application No. PCT/EP14/02163 (published as WO 2015/018520); or PCT application No. PCT/EP14/02165 (published as WO2015/018522).

Preferably, the second therapeutic agent is an agent useful in the treatment of a disease or condition selected from diffuse large B-cell lymphoma (DLBCL) and anaplastic lymphoma kinase (ALK)-positive anaplastic large cell lymphoma.

In some embodiments, the second therapeutic agent is selected from mTOR inhibitor (e.g. BEZ235 (NVP-BEZ235), Everolimus (RAD001), Rapamycin (Sirolimus, AY22989, NSC226080), AZD8055, PI-103, Temsirolimus, Ku-0063794, GDC-0349, Torin 2, INK 128 (MLN-0128), AZD2014, NVP-BGT226 (BGT226), PF-04691502, CH5132799, GDC-0980 (RG7422), Torin 1, WAY-600, WYE-125132 (WYE-132), WYE-687, GSK2126458 (GSK458), PF-05212384 (PKI-587), PP-121, OSI-027(ASP4786), Palomid 529 (P529), PP242, XL765 (SAR245409), GSK1059615, WYE-354, Deforolimus (Ridaforolimus, MK-8669)); a PI3K inhibitor (e.g. Idelalisib (GS-1101 or CAL-101), Perifosine (1,1-Dimethylpiperidinium-4-yl octadecyl phosphate, D21266, or KRX 0401), PK-866, IPI-1145, Copanlisib (BAY 80-6946), Wortmannin, LY294002, XL-147, SF-1126, GDC0941, PI-103, NCPBEZ235, XL765, GSK212645, PKI-587, MK2206, PF-04691502, ICI87114, Rapamycin, Torin 1, AZD-8055, OSI-027); a BTK inhibitor (e.g. PCI-32765 (Ibrutinib), GDC-0834, LFM-A13, Terreic acid); an HDAC inhibitor (e.g. Vorinostat (SAHA, MK0683), Entinostat (MS-275, SNDX-275), Panobinostat (LBH589, NVP-LBH589), Trichostatin A (TSA), Mocetinostat (MGCD0103, MG0103), Belinostat (PXD101), MC1568, LAQ824 (NVP-LAQ824, Dacinostat), Tubastatin A HCl, CUDC-101, SB939 (Pracinostat), Droxinostat, JNJ-26481585 (Quisinostat), PCI-24781 (CRA-024781), Romidepsin (FK228, depsipeptide), AR-42 (OSU-HDAC42), Valproic acid sodium salt (Sodium valproate), PCI-34051, CI994 (Tacedinaline), M344, PI3K/HDAC Inhibitor I, Rocilinostat (ACY-1215), Apicidin (OSI-2040), Scriptaid, Tubastatin A, Sodium Phenylbutyrate, Resminostat (RAS2410)); an anti-CD20 monoclonal antibody (e.g. Rituximab, Y⁹⁰—Ibritumomab tiuxetan, tositumomab, I¹³¹-tositumomab, Ofatumumab, Ocrelizumab, TRU-015, Veltuzumab, AME-133v, PR0131921 humanized (Version 114), GA101); a hypomethylating agent; an immunomodulant; and an ALK inhibitor (e.g. AP26113, ASP3026, CH5424802 (AF802), LDK378, X-396, Crizotinib (Xalkori, PF-02341066), Herbimycin A, CEP28122). In some aspects of these embodiments, the second therapeutic agent is selected from ibrutinib, idelalisib, vorinostat, rituximab, lenalidomide, decitabine, everolimus, romodepsin, bendamustine, doxorubicin, CEP28122, Crizotinib, AP26113, and LDK378. In some embodiments, the second therapeutic agent is azacitidine (AZA).

In another embodiment, the invention provides separate dosage forms of a compound of this invention and one or more of any of the above-described second therapeutic agents, wherein the compound and second therapeutic agent are associated with one another. The term “associated with one another” as used herein means that the separate dosage forms are packaged together or otherwise attached to one another such that it is readily apparent that the separate dosage forms are intended to be sold and administered together (within less than 24 hours of one another, consecutively or simultaneously).

In the pharmaceutical compositions of the invention, the compound of the present invention is present in an effective amount. As used herein, the term “effective amount” refers to an amount which, when administered in a proper dosing regimen, is sufficient to treat the target disorder.

The interrelationship of dosages for animals and humans (based on milligrams per meter squared of body surface) is described in Freireich et al., Cancer Chemother. Rep, 1966, 50: 219. Body surface area may be approximately determined from height and weight of the subject. See, e.g., Scientific Tables, Geigy Pharmaceuticals, Ardsley, N.Y., 1970, 537.

In one embodiment, an effective amount of a compound of this invention can be 5 mg per dose. In one embodiment, an effective amount of a compound of this invention can be 10 mg per dose. In one embodiment, an effective amount of a compound of this invention can be 20 mg per dose. In one embodiment, an effective amount of a compound of this invention can be 40 mg per dose. In one embodiment, an effective amount of a compound of this invention can be 80 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 2 mg to about 160 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 2 mg to about 80 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 2 mg to about 40 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 2 mg to about 20 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 1 mg to about 400 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 1 mg to about 200 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 1 mg to about 100 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 1 mg to about 50 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 0.1 mg to about 800 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 0.1 mg to about 400 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 0.1 mg to about 200 mg per dose. In some embodiments, an effective amount of a compound of this invention can range from about 0.1 mg to about 100 mg per dose. In one embodiment, the dose is administered twice daily. In one embodiment, the dose is administered once daily.

Effective doses will also vary, as recognized by those skilled in the art, depending on the diseases treated, the severity of the disease, the route of administration, the sex, age and general health condition of the subject, excipient usage, the possibility of co-usage with other therapeutic treatments such as use of other agents and the judgment of the treating physician. For example, guidance for selecting an effective dose can be determined by reference to the prescribing information for OTX-015.

For pharmaceutical compositions that comprise a second therapeutic agent, an effective amount of the second therapeutic agent is between about 20% and 100% of the dosage normally utilized in a monotherapy regime using just that agent. Preferably, an effective amount is between about 70% and 100% of the normal monotherapeutic dose. The normal monotherapeutic dosages of these second therapeutic agents are well known in the art. See, e.g., Wells et al., eds., Pharmacotherapy Handbook, 2nd Edition, Appleton and Lange, Stamford, Conn. (2000); PDR Pharmacopoeia, Tarascon Pocket Pharmacopoeia 2000, Deluxe Edition, Tarascon Publishing, Loma Linda, Calif. (2000), each of which references are incorporated herein by reference in their entirety.

It is expected that some of the second therapeutic agents referenced above will act synergistically with the compounds of this invention. When this occurs, it will allow the effective dosage of the second therapeutic agent and/or the compound of this invention to be reduced from that required in a monotherapy. This has the advantage of minimizing toxic side effects of either the second therapeutic agent of a compound of this invention, synergistic improvements in efficacy, improved ease of administration or use and/or reduced overall expense of compound preparation or formulation.

Methods of Treatment

In another embodiment, the invention provides a method of inhibiting binding between an acetylated histone and a bromodomain-containing protein in a cell, comprising contacting a cell with one or more compounds of Formula I herein, or a pharmaceutically acceptable salt thereof. In some embodiments, bromodomain-containing protein is a bromodomain and extraterminal domain (BET) family protein. In some aspects of these embodiments, bromodomain and extraterminal domain (BET) family protein is BRD2, BRD3, BRD4 or BRDt. In some embodiments, acetylated histone is H1, H2A, H2B, H3 or H4.

In some embodiments, the invention provides a method of inhibiting adhesion of leukocytes to vascular endothelial cells. In some aspects of these embodiments, the invention provides a method of inhibiting the expression of Mac-1 (CD11b), VCAM-1 and E-selectin that are adhesion molecules responsible for the disease state of an inflammatory bowel disease.

According to another embodiment, the invention provides a method of treating a disease that is beneficially treated by OTX-015 in a subject in need thereof, comprising the step of administering to the subject an effective amount of a compound or a composition of this invention. In one embodiment the subject is a patient in need of such treatment. Such diseases are well known in the art and are disclosed in, but not limited to the following patents and published applications: U.S. Pat. No. 8,476,260; EP patent No. 989,131; U.S. Pat. No. 5,712,274; PCT application No. PCT/EP2013/063313 (published as WO2014001356); PCT application No. PCT/EP2014/066629 (published as WO2015014998); PCT application No. PCT/EP2014/002166 (published as WO2015018523); PCT application No. PCT/EP2014/002165 (published as WO2015018522); US application publication No. 20030130268; PCT application No. PCT/EP2014/002163 (WO2015018520); PCT application No. PCT/EP2014/002164 (published as WO2015018521); and PCT application No. PCT/US2014/019701 (published as WO2014134583).

Such diseases include, but are not limited to, inflammatory diseases and allergic diseases caused by cell adhesion (e.g. inflammatory bowel disease, ulcerative colitis, and Crohn's disease); hematologic cancer (e.g. lymphoma (e.g. Burkitt's lymphoma, splenic marginal zone lymphoma, Hodgkin's lymphoma (e.g. nodular sclerosis classical Hodgkin's lymphoma (CHL), mixed cellularity CHL, lymphocyte-depletion CHL, lymphocyte-rich CHL, and nodular lymphocyte predominant Hodgkin's lymphoma); non-Hodgkin's lymphoma (e.g. AIDS-related lymphoma, anaplastic large-cell lymphoma (e.g. anaplastic lymphoma kinase (ALK)-positive anaplastic large cell lymphoma), angioimmunoblastic lymphoma, blastic NK-cell lymphoma, chronic lymphocytic leukemia/small lymphocytic lymphoma, cutaneous T-cell lymphoma, diffuse large B-cell lymphoma (DLBCL), enteropathy-type T-cell lymphoma, follicular lymphoma, hepatosplenic gamma-delta T-cell lymphoma, lymphoblastic lymphoma, marginal zone lymphoma, nasal T-cell lymphoma, pediatric lymphoma, peripheral T-cell lymphoma, primary central nervous system lymphoma, T-cell leukemia, transformed lymphoma, treatment-related T-cell lymphoma, Waldenstrom's macroglobulinemia)) and leukemia (e.g. chronic myeloid leukemia, promyelocytic leukemia, lymphoblastic leukemia, acute lymphoblastic leukemia, acute myeloid leukemia (AML), BCR-ABL positive acute lymphoblastic leukemia, and CD34 positive acute myeloid leukemia)), myeloma (e.g. multiple myeloma), liver cancer (e.g. hepatocarcinoma), ovarian cancer, prostate cancer (e.g. Castrate-resistant Prostate Cancer (CRPC)), lung cancer (e.g. non-small cell lung cancer, Non-small Cell Lung Cancer With Rearranged ALK Gene/Fusion Protein or KRAS Mutation, lung large cell carcinoma, and lung adenocarcinoma), osteosarcoma, colorectal cancer, breast cancer (e.g. triple negative breast cancer), skin cancer, renal cancer, colon cancer, brain cancer (e.g. Recurrent Glioblastoma Multiforme (GBM)), pancreatic cancer (e.g. Pancreatic Ductal Adenocarcinoma), head and neck cancer, and epithelial cell cancer (e.g. midline carcinoma, BRD-NUT Midline Carcinoma).

In one particular embodiment, the method of this invention is used to treat a disease or condition selected from Recurrent Glioblastoma Multiforme (GBM), hematological malignancies (e.g. acute leukemia, Acute Myeloid Leukemia (AML)), Non-small Cell Lung Cancer With Rearranged ALK Gene/Fusion Protein or KRAS Mutation, Castrate-resistant Prostate Cancer (CRPC), Pancreatic Ductal Adenocarcinoma in a subject in need thereof.

Identifying a subject in need of such treatment can be in the judgment of a subject or a health care professional and can be subjective (e.g. opinion) or objective (e.g. measurable by a test or diagnostic method).

In another embodiment, any of the above methods of treatment comprises the further step of co-administering to the subject in need thereof one or more second therapeutic agents. The choice of second therapeutic agent may be made from any second therapeutic agent known to be useful for co-administration with OTX-015. The choice of second therapeutic agent is also dependent upon the particular disease or condition to be treated. Examples of second therapeutic agents that may be employed in the methods of this invention are those set forth above for use in combination compositions comprising a compound of this invention and a second therapeutic agent.

In particular, the combination therapies of this invention include co-administering a compound of Formula I and a second therapeutic agent to a subject in need thereof for treatment of the following conditions: acute myeloid leukemia (AML) (azacitidine).

The term “co-administered” as used herein means that the second therapeutic agent may be administered together with a compound of this invention as part of a single dosage form (such as a composition of this invention comprising a compound of the invention and an second therapeutic agent as described above) or as separate, multiple dosage forms. Alternatively, the additional agent may be administered prior to, consecutively with, or following the administration of a compound of this invention. In such combination therapy treatment, both the compounds of this invention and the second therapeutic agent(s) are administered by conventional methods. The administration of a composition of this invention, comprising both a compound of the invention and a second therapeutic agent, to a subject does not preclude the separate administration of that same therapeutic agent, any other second therapeutic agent or any compound of this invention to said subject at another time during a course of treatment.

Effective amounts of these second therapeutic agents are well known to those skilled in the art and guidance for dosing may be found in patents and published patent applications referenced herein, as well as in Wells et al., eds., Pharmacotherapy Handbook, 2nd Edition, Appleton and Lange, Stamford, Conn. (2000); PDR Pharmacopoeia, Tarascon Pocket Pharmacopoeia 2000, Deluxe Edition, Tarascon Publishing, Loma Linda, Calif. (2000), and other medical texts. However, it is well within the skilled artisan's purview to determine the second therapeutic agent's optimal effective-amount range.

In one embodiment of the invention, where a second therapeutic agent is administered to a subject, the effective amount of the compound of this invention is less than its effective amount would be where the second therapeutic agent is not administered. In another embodiment, the effective amount of the second therapeutic agent is less than its effective amount would be where the compound of this invention is not administered. In this way, undesired side effects associated with high doses of either agent may be minimized. Other potential advantages (including without limitation improved dosing regimens and/or reduced drug cost) will be apparent to those of skill in the art.

In yet another aspect, the invention provides the use of a compound of Formula I alone or together with one or more of the above-described second therapeutic agents in the manufacture of a medicament, either as a single composition or as separate dosage forms, for treatment in a subject of a disease, disorder or symptom set forth above. Another aspect of the invention is a compound of Formula I for use in the treatment in a subject of a disease, disorder or symptom thereof delineated herein.

Example 1. Evaluation of Metabolic Stability

Microsomal Assay:

Human liver microsomes (20 mg/mL) are obtained from Xenotech, LLC (Lenexa, Kans.). β-nicotinamide adenine dinucleotide phosphate, reduced form (NADPH), magnesium chloride (MgCl₂), and dimethyl sulfoxide (DMSO) are purchased from Sigma-Aldrich.

Determination of Metabolic Stability:

7.5 mM stock solutions of test compounds are prepared in DMSO. The 7.5 mM stock solutions are diluted to 12.5-50 μM in acetonitrile (ACN). The 20 mg/mL human liver microsomes are diluted to 0.625 mg/mL in 0.1 M potassium phosphate buffer, pH 7.4, containing 3 mM MgCl₂. The diluted microsomes are added to wells of a 96-well deep-well polypropylene plate in triplicate. A 10 μL aliquot of the 12.5-50 μM test compound is added to the microsomes and the mixture is pre-warmed for 10 minutes. Reactions are initiated by addition of pre-warmed NADPH solution. The final reaction volume is 0.5 mL and contains 0.5 mg/mL human liver microsomes, 0.25-1.0 μM test compound, and 2 mM NADPH in 0.1 M potassium phosphate buffer, pH 7.4, and 3 mM MgCl₂. The reaction mixtures are incubated at 37° C., and 50 μL aliquots are removed at 0, 5, 10, 20, and 30 minutes and added to shallow-well 96-well plates which contain 50 μL of ice-cold ACN with internal standard to stop the reactions. The plates are stored at 4° C. for 20 minutes after which 100 μL of water is added to the wells of the plate before centrifugation to pellet precipitated proteins. Supernatants are transferred to another 96-well plate and analyzed for amounts of parent remaining by LC-MS/MS using an Applied Bio-systems API 4000 mass spectrometer. The same procedure is followed for the non-deuterated counterpart of the compound of Formula I and the positive control, 7-ethoxycoumarin (1 μM). Testing is done in triplicate.

Data Analysis:

The in vitro t_(1/2)s for test compounds are calculated from the slopes of the linear regression of % parent remaining (ln) vs incubation time relationship. in vitro t _(1/2)=0.693/k k=−[slope of linear regression of % parent remaining (ln) vs incubation time]

Data analysis is performed using Microsoft Excel Software. Without further description, it is believed that one of ordinary skill in the art can, using the preceding description and the illustrative examples, make and utilize the compounds of the present invention and practice the claimed methods. It should be understood that the foregoing discussion and examples merely present a detailed description of certain preferred embodiments. It will be apparent to those of ordinary skill in the art that various modifications and equivalents can be made without departing from the spirit and scope of the invention. 

We claim:
 1. A compound of Formula I:

or a pharmaceutically acceptable salt thereof, wherein R¹ and R² are each CD₃ and R³ is CH₃; or R² and R³ are each CD₃ and R¹ is CH₃; or R¹, R², and R³ are each CD₃; and each of Y¹, Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b), Y^(5a), Y^(5b), Y^(6a), and Y^(6b) is independently selected from hydrogen and deuterium; wherein each position designated specifically as deuterium has at least 50.1% incorporation of deuterium.
 2. The compound of claim 1, wherein Y^(2a) and Y^(2b) are the same; Y^(3a) and Y^(3b) are the same; Y^(4a) and Y^(4b) are the same; Y^(5a) and Y^(5b) are the same; and Y^(6a) and Y^(6b) are the same.
 3. The compound of claim 2, wherein R¹, R², and R³ are each CD₃.
 4. The compound of claim 2, wherein R² and R³ are each CD₃ and R¹ is CH₃.
 5. The compound of claim 2, wherein R¹ and R² are each CD₃ and R³ is CH₃.
 6. The compound of claim 2, wherein Y¹ is deuterium.
 7. The compound of claim 2, wherein Y¹ is hydrogen.
 8. The compound of claim 2, wherein Y^(2a) and Y^(2b) are each deuterium.
 9. The compound of claim 2, wherein Y^(2a) and Y^(2b) are each hydrogen.
 10. The compound of claim 2, wherein Y^(3a), Y^(3b), Y^(4a), and Y^(4b) are each hydrogen.
 11. The compound of claim 2, wherein Y^(5a), Y^(5b), Y^(6a), and Y^(6b) are each hydrogen.
 12. The compound of claim 1, wherein any atom not designated as deuterium is present at its natural isotopic abundance.
 13. The compound of claim 2, wherein the compound is selected from any one of the compounds (Cmpd) set forth in table below: Y^(3a)/ Y^(4a)/ Y^(5a)/ Y^(6a)/ Cmpd R¹ R² R³ Y¹ Y^(2a)/Y^(2b) Y^(3b) Y^(4b) Y^(5b) Y^(6b) 201 CD₃ CD₃ CD₃ D D D D D D 202 CD₃ CD₃ CD₃ H D D D D D 203 CD₃ CD₃ CD₃ D H D D D D 204 CD₃ CD₃ CD₃ H H D D D D 205 CD₃ CD₃ CD₃ D D H D D D 206 CD₃ CD₃ CD₃ D D D D H D 207 CD₃ CD₃ CD₃ D D H H D D 208 CD₃ CD₃ CD₃ D D D D H H 209 CD₃ CD₃ CD₃ D D H H H H 210 CD₃ CD₃ CD₃ H H H H H H 221 CH₃ CD₃ CD₃ D D D D D D 222 CH₃ CD₃ CD₃ H D D D D D 223 CH₃ CD₃ CD₃ D H D D D D 224 CH₃ CD₃ CD₃ H H D D D D 225 CH₃ CD₃ CD₃ D D H D D D 226 CH₃ CD₃ CD₃ D D D D H D 227 CH₃ CD₃ CD₃ D D H H D D 228 CH₃ CD₃ CD₃ D D D D H H 229 CH₃ CD₃ CD₃ D D H H H H 230 CH₃ CD₃ CD₃ H H H H H H 251 CD₃ CD₃ CH₃ D D D D D D 252 CD₃ CD₃ CH₃ H D D D D D 253 CD₃ CD₃ CH₃ D H D D D D 254 CD₃ CD₃ CH₃ H H D D D D 255 CD₃ CD₃ CH₃ D D H D D D 256 CD₃ CD₃ CH₃ D D D D H D 257 CD₃ CD₃ CH₃ D D H H D D 258 CD₃ CD₃ CH₃ D D D D H H 259 CD₃ CD₃ CH₃ D D H H H H 260 CD₃ CD₃ CH₃ H H H H H H,

or a pharmaceutically acceptable salt thereof, wherein any atom not designated as deuterium is present at its natural isotopic abundance.
 14. A pharmaceutical composition comprising a compound of claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
 15. A method of inhibiting binding between an acetylated histone and a bromodomain-containing protein in a cell, comprising contacting the cell with a compound of claim 1 or a composition of claim
 14. 16. A method of treating a disease or condition selected from recurrent glioblastoma multiforme (GBM), hematological malignancies, acute leukemia, acute myeloid leukemia (AML), non-small cell lung cancer with rearranged ALK gene/fusion protein or KRAS Mutation, castrate-resistant prostate cancer (CRPC), and pancreatic ductal adenocarcinoma, comprising the step of administering to a subject in need thereof a compound of claim 1 or a composition of claim
 14. 17. The compound of claim 1, wherein each position designated specifically as deuterium has at least 90% incorporation of deuterium.
 18. The compound of claim 1, wherein each position designated specifically as deuterium has at least 95% incorporation of deuterium.
 19. The compound of claim 1, wherein each position designated specifically as deuterium has at least 97% incorporation of deuterium.
 20. The compound of claim 1, wherein R¹ and R² are each CD₃ and R³ is CH_(3;) Y¹ is deuterium; and each of Y^(2a), Y^(2b), Y^(3a), Y^(3b), Y^(4a), Y^(4b), Y^(5a), Y^(5b), Y^(6a), and Y^(6b) is hydrogen, or a pharmaceutically acceptable salt thereof.
 21. The compound of claim 20, or a pharmaceutically acceptable salt thereof, wherein any atom not designated as deuterium is present at its natural isotopic abundance.
 22. The compound of claim 20, wherein each position designated specifically as deuterium has at least 90% incorporation of deuterium.
 23. The compound of claim 20, wherein each position designated specifically as deuterium has at least 95% incorporation of deuterium.
 24. The compound of claim 20, wherein each position designated specifically as deuterium has at least 97% incorporation of deuterium. 